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v in (-oo:+oo)
(-1/6)*v-(1/6) = (-1/9)*v-(1/9) // - (-1/9)*v-(1/9)
(-1/6)*v-((-1/9)*v)-(1/6)+1/9 = 0
(-1/6)*v+(1/9)*v-1/6+1/9 = 0
-1/18*v-1/18 = 0 // + 1/18
-1/18*v = 1/18 // : -1/18
v = 1/18/(-1/18)
v = -1
v = -1
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